CVE-2025-12233
📋 TL;DR
A buffer overflow vulnerability in Tenda CH22 routers allows remote attackers to execute arbitrary code by manipulating the 'page' parameter in the fromSafeUrlFilter function. This affects Tenda CH22 routers running firmware version 1.0.0.1. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- Tenda CH22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to other systems.
Likely Case
Device takeover enabling traffic interception, DNS manipulation, credential theft, and botnet recruitment.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making weaponization highly probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Upload via router admin interface. 4. Reboot router.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Tenda CH22 routers from critical networks and internet exposure
Access Control Lists
allRestrict access to router management interface to trusted IPs only
🧯 If You Can't Patch
- Replace vulnerable routers with different models or brands
- Deploy network-based intrusion prevention systems to detect and block exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface (typically at 192.168.0.1 or 192.168.1.1)Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is updated to a version later than 1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SafeUrlFilter
- Router reboot events
- Configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Port scanning from router IP
SIEM Query:
source="router_logs" AND (uri="/goform/SafeUrlFilter" OR event="buffer_overflow")